Improved core-spindle for casting



UNITED STATES PATENT OFFICE..

D. A. WEBSTER, oF NEW YORK, N. Y., AND G. E. RURROUGHS, on LUMRERTON, NEW JERSEY.

IMPROVED CORE-SPINDLE FOR CASTING.

Specification forming part of' Letters Patent No. 18,48 l. dated October 20, 1857.

To all whom vit) may concern:

Be it known that we, D. A. WEBSTER, of New York, State of New York, and G. F. BUR- RoUG'Hs,ofLumberton,countyofurlingtomin the State of New Jersey, have invented a new I and useful Improvement in Gollapsing Core- Spindles for Casting Hollow rIubes,&e. and we do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

The nature of our inventionconsists of an improved collapsing core-spindle (for casting hollow tubes, either cylindrical or polygonal, with either one end closed or both open) formed of segmental staves adjusted by followers which operate against inclined planes upon the internal surfaces of said staves, and which are governed by a transverse shaft running through the center ot' the core-spindle and passing through two heads, as hereinafter described.

To enable others skilled in the art to make and use our invention, we will proceed to describe its construction and operation.

In the accompanying drawings, Figure No. l represents a longitudinal sectionthrough the center of our improved core-spindle; Fig. 2, a top view; Fig. 3, a horizontal or cross section at F G, Fig. l; and Fig. 4, a partial longitudinal section showing a modification of the corespindle as constructed for casting, one end of the tube closed; and Fig. 5, a detached portion of shaft, shown of link or chain construction to adapt itself to irregular or curved tubes.

C C represent the staves which form the cylinder ofthe core-spindle, any desired number of which may be used to constitute the corecylinder. Said staves are constructed as shown in the drawings, and furnished with ai r or vent holes d d. On theinternal surfaces of said staves are formed inclined projections D, running entirely around in a cross or horizcntal section, and placed at regular intervals in a vertical or longitudinal section of said corecylinder. The angle of inclinationof said projections D D increases in each successively as they become nearer to the bottom of said core-cylinder, for the purpose of insuring the drawing ofthe core-spindle, though the operation could be performed with the inclined projections similar.

E E are two heads, furnished with lianges on their extreme diameter for embracing the ends of the staves C G, which are tapered to accommodate themselves to said heads. In the Vlower head, F/, is formed a nut, s, in which works the thread or screw 1- on the lower end of shaft A. Said shaft A passes through the upper head, E, and is furnished with a collar which takes its bearing against the side of said head. On the upper end of said shaft is formed a head or square77 adapted to a winch or wrench, whichmay be used to turn said shaft when required, as will be shown directly.

B B are the disk-followers,77 which are retained in position on the shaft A longitudinally by means of a collar, but are not compelled to rotate with said shaft. Said followers are placed at such intervals on the shaft A as that they shall come opposite to or operate against, respectively, the inclined projections D D, and have the periphery or edge beveled to Suit the inclination of said projections.

m m are simple braces for strengthening the staves G C.

e c, Fig. 3, represent the joints of the staves, which need not be close, and the angle of which or line on which they are made is of little importance.

rlhe operation of our improved core-spindle may be readily comprehended, and is briefly as follows, viz: In casting, for instance, a hollow cylinder with both ends open, (to Which the core-spindle here represented is adapted,) the mold having been prepared, the iiasks secured, &c., and the core prepared in the ordinary manner upon ourimproved core-spindle, we place said core in the mold'in the usual way and pour the metal. 'Vhen the metal is sufficiently settled or in the proper State,we apply a wrench or winch to the head c of shaft A and rotate said shaft, whereby said shaft (having its screw 1' working in the stationary nut s) is elevated, carrying with it the followers B B, and thus releasing from strain against the flanges c e of head E the staves OC, which form the core-cylinder, or allowing the corespindle to collapse for the shrinkage of the metal and extraction of the core.

If desired to cast a tube with the lowerI end closed, we construct the bottom head, E, as shown at Fig. 4, and form the nut s in the npper head and the screw r on upper end of shaft A, as shown, when the core formed is adapted to cast a tube, as required, the operation of collapsing being substantially the same as already described. d

It will be observed that with our improved core-spindle, being formed of staves and secured and adjusted by the transverse shaft and followers acting upon and sustaining the cylinder or staves at regular intervals, the core-spindle is rendered very strong, (which is a very necessary consideratioin) while it is readily collapsed and withdrawn when required.

XVe would state that ouriniprovement is peculiarly adapted to heavy work, casting very large pipe, where the pressure on the core is very great, and the core is consequently required to be very strong, to acquire which necessary strength it is necessary to brace and secure the core-staves thr'oughout their entire length and equally in all parts.

XVe are aware that core-spindles have been made with a wedge-stave secured at either end,

but do not consider such a mechanism at all practicable in casting heavy work.

Ve do not claim, broadly, a collapsing corespindle, asowe .know its use is common; nor do we claim a hollow cylinder composed of staves or their equivalents; but,

Having described the construction and operation of our improvement, whatwe claim as our invention, and desire to secure by Letters Patent, is-

l. The combination of a transverse center shaft with the disk-followers B B and inclined projections D D, substantially as and for the purpose set forth.

2. The bottom head, E', constructed as described, in combination with the shaft A and followers B B, substantially as described, whereby we are enabled to cast one end ofthe tube closed, the whole arranged as set forth.

In testimony whereof we have hereunto set our hands and seals this 29th day of May, 1857.

.DANIEL A. wnnsrnn. [L s] eno. F. nURnoUGHs. [n s] Vitnesses:

JOSEPH W. FORD, THoMAs C. POLHEMER. 

